Apple has long positioned itself as the architect of a seamless, integrated world — but the arrival of its new Siri AI reveals how much of that world is borrowed. Launched this week alongside iOS 27 and the iPhone 18 Pro, the assistant cannot read Gmail or WhatsApp messages, exposing a quiet dependency: Apple's most ambitious AI promises rest on the goodwill of competitors who have little reason to offer it. In the broader story of technological power, this moment asks whether vertical integration is truly a fortress, or simply a wall with many doors held shut from the outside.